<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        div{
            width: 100px;
            height: 100px; 
            background: red;
            margin-left: 100px;
            margin-top: 200px;
            margin-bottom: 200px;
            padding-bottom: 50px;
            padding-left: 50px;
            padding-right: 50px;
            /*border:width style color
            style solid/dotted
            */
            border: 10px solid black;
        }
    
    </style>
</head>
<body>
    <div>

    </div>
    <p>hello world</p>
</body>
</html>